Gerund functioning as an uncountable noun denoting the act or process of recovery.
Definitions
The act or process of recovering from illness, injury, or fatigue. Recuperating in the countryside took longer than he expected.
recuperategerund / present participle Used attributively to denote someone or something that is in the process of recovering.
Definitions
Undergoing recovery from illness, exertion, or difficulty. The recuperating soldiers were transferred to a convalescent ward.